Sawietg-machibte



UNITED STATES PATENT OFFICE.

CAREY PITTS, OF TROY, ALABAMA.

SAWING-MACHINE.

Specification of Letters Patent No. 29,003, dated J' uly 3, 1860.

To all whom it may concern."

Be it known that I, CAREY Prr'rs, of Troy, in the county of Pike and State of Alabama, have invented certain new and useful Improvements in the Manner of Operating Reciprocating Saws in Sawing Machinery `Whether in Sawmills or Shop-Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompany ing drawings, making a part of this specification, in which- Figure l represents in perspective so much of a frame, and mechanism, as will illustrate the manner of operating the saw, and Fig. 2, represents a vertical longitudinal section through the same.

Similar letters of reference where they occur in the separate figures denote like parts in bothl of the drawings.

I am aware that, saws have been strained by a spring at each of its ends, but this is not my invention, as it will not accomplish what I aim at.

My invention consists in raising a saw, whether in a sash or otherwise, against the action of a spring, which is compressed or bent by such raising, and when sufficiently raised, is suddenly released so that, the whole recoil of the spring shall be expended in driving the saw through the wood or lumber, by a quick throw, and at much greater speed than it is raised up by.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings.

Heretofore, saws have been operated in both its reciprocations, by one and the same means whether it be by crank, cam, or vibrating bar, and hence the up and down motion is always the same in speed. I propose to raise by one means or mechanism, and to bring it down by a separate means or mechanism, so that however gradually it may rise, it shall come down with a quick cutting motion. And this plan of working reciprocating saws may be applied to sawmill saws or to scroll sawing machines.

A, represents a frame of any ordinary construction, to which fender posts B, B, are atlixed; and on or against these fender posts a saw sash or gate may work, in any of the usual well known ways, said sash or gate carrying a saw C, of any known kind.

At the top of the saw-gate is attached a spring pole or bar D (any other spring whether of steel, straight, or coiled, or of rubber, may answer the purpose), to keep the saw strained, and prevent its buckling, said spring being connected with the noddleiron a, as shown. Below the saw gate is another, and a superior spring E, the recoil of which brings down the gate and saw. This spring, too, may be of any of the known kinds of springs applicable to such a purpose, and that will aHect the same purpose. These two springs D, E, work against each other, one resisting the other, but both aiding to keep the saw strained andsteady. The one E, has much more power in it than the other D.

Below the gate is hung a shaft F, which may be driven by any rst moving power. Upon this shaft there is a lifting piece or cam Gr (one, two, or more may be used), which as the shaft F revolves, raises up the gate, and by so doing strains up the spring E, the spring D, keeping the saw straight by its recoil. The moment the point of the lifting piece G, lea-ves the gate or its connected parts the recoil of the strained spring E brings down the gate and saw with a sudden jerk or throw, which drives the saw through the stuft' that is being acted on. H, is another cam on the shaft F for feeding along the carriage I past the saw, through the lever J, dog Z), and ratchet c. I do not however confine my invention to any special feed motion, for the saw may be used without a carriage at all, as in scroll sawing machines, to which purpose I propose to apply it.

I have represented the spring E, as connected to the saw gate by a link d, and the lifter Gr as taking under the spring. This is not necessary, as the lifter may be anywhere else, even over the saw gate if desirable to put it there. Any other means may be used than those shown, though they are simple and eficient. The object is to raise up the saw or saw gate, by a positive motion, however slow, and allo-w it to fly, by the'action of a strained spring, with a sudden jerk, or very quick motion, into the stuff to be cut by it.

Having thus fully described my invenstu to be cut With a quick jerk or motion, tion, and the difference between it, and substantially in the manner described and 10 other things for a similar purpose, what I represented. claim is 5 Raising a saw, or saw gate, by a positive motion, and against the action of a spring, Witnesses: Which spring, When the raising mechanism A. B. STOUGHTON, ceases t0 act, brings down the saw into the C. COHEN.

CAREY PITTS. 

